Oscillatory phenomena in oxygen and hydrogen peroxide reduction on the Au(100) electrode surface in alkaline solutions
Oscillatory phenomena in oxygen and hydrogen peroxide reduction on the Au(100) electrode surface in alkaline solutions
复制标题
碱性溶液中Au(100)电极表面氧气和过氧化氢还原的振荡现象
DOI：
10.1016/0022-0728(92)80549-j
复制
发表时间：
1992
影响因子：
4.5
通讯作者：
R. Adzic
中科院分区：
文献类型：
--
作者：
S. Štrbac;R. Adzic
振荡行为是已知的几种电化学反应[11]。第一类包括金属在钝化状态不稳定区域内的阳极极化过程。特别有趣的是铜的阳极溶解，其振荡行为被解释为铜氧化物层的周期性形成和破裂[2,3]。第二类阳极振荡过程包括几种小有机化合物的氧化，即HCHO [41， CO 151, HCOOH 161。迄今为止，阴极振荡过程的唯一例子是几种n型含铜半导体在H， O还原过程中的电流振荡[1,7,8]。令人惊讶的是，在金属Cu和Cu， O上的H， O还原没有观察到振荡，这表明这种现象对特定电极表面性质的敏感性。在这项工作中，我们报告了在碱性溶液中（100）取向的旋转金电极上发现的氧和过氧化氢还原振荡行为的初步数据。据我们所知，这是第一次观察到电流振荡在0，减少。在其他两个低折射率平面上，或者在Au（100）的12个不同的取向和邻近位置上，如Au (910)= Au [9 (100 X (lOO))]，都没有观察到振荡。对于这个表面，只观察到振荡行为的迹象。Au（100）表面是碱性溶液中还原0的最佳催化剂，甚至优于多晶铂电极[9-121]。该表面的一个特殊特征是，在部分放电的Au (OH)-(' - ")层形成的电位范围内，通过交换四个电子进行还原
Oscillatory behavior is known for several classes of electrochemical reactions [ll. The first class includes those during the anodic polarization of metals in the region of the instability of the passive state. Particularly interesting appears to be the anodic dissolution of copper, for which the oscillatory behavior was interpreted in terms of periodic formation and rupture of a layer of copper oxides [2, 3]. The second large class of anodic oscillation processes includes oxidation of several small organic compounds, namely HCHO [41, CO 151, HCOOH 161. The only example of a cathodic oscillation process to date is the current oscillations during H, O, reduction on several n-type copper-containing semiconductors [1, 7, 8]. Surprisingly, the oscillations were not observed for H, O, reduction on metallic Cu and Cu, O which indicates the sensitivity of the phenomenon to a particular set of electrode surface properties. In this work we report preliminary data for oscillatory behavior found in oxygen and hydrogen peroxide reduction on a rotating gold electrode with (100) orientation in alkaline solutions. To the best of our knowledge this is the first observation of the current oscillations in 0, reduction. Oscillations were not observed for either of the two other low index planes, or for the twelve different orientations and vicinals of Au (100) with very wide terraces, such as Au (910)= Au [9 (100 X (lOO))]. For this surface, only an indication of oscillatory behavior was observed. The Au (100) surface is the best catalyst for 0, reduction in alkaline solutions, even better than the polycrystalline platinum electrode [9-121. A particular feature of this surface is that in the potential range of formation of the partly discharged Au (OH)-(‘-“) layer, 0, reduction takes place with the exchange of four electrons